Microwave Oven Suddenly, my microwave doesn't seem to be heating. I sounds like it's running and the turntable still turns but when the timer is done, the food is still cold. What could be causing this?

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HI..there
is a heating filament of an oven MAGNETRON..it s responsible of
producing heat to the oven..possibly this is defective ..this filament
must be replaced by a new one..theres no problem with the motor cos it
runs the table power and light button seems working..HOPE THIS HELPS

The most likely problem is the magnetron that heats the food, the other less likely is the high voltage transformer that energizes the magnetron. To replace either part with labor would be as much if not more than a brand new microwave oven.

If the lights and turntable are both working but there's no heating, the oven has a bad magnetron tube (the microwave source), a bad part in the tube's power supply, or there's a problem with the control circuit board. If the turntable isn't turning, the trouble may be caused by one of the oven's door switches. Microwave ovens can be dangerous to work on, and there's a chance of leakage if repairs aren't done correctly. You should have a professional diagnose the problem and give an
estimate. For some repairs it may only cost a little more for a new oven.